VTY interface support

Let's add a VTY interface on TCP port 4269.  The purpose is - for now -
not for configuration storage, but for state introspection.

Change-Id: I47b6e4efaad52e68e2b50a7993076f3706f86628

1 files changed, 139 insertions, 0 deletions

diff --git a/src/vty.c b/src/vty.c
new file mode 100644
index 0000000..88b6257
--- /dev/null
+++ b/src/vty.c
@@ -0,0 +1,139 @@
+/* osmo-e1d VTY interface */
+/* (C) 2020 by Harald Welte <laforge@osmocom.org>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#define _GNU_SOURCE	/* struct ucred */
+#include <sys/socket.h>
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <time.h>
+
+#include <osmocom/core/linuxlist.h>
+
+#include <osmocom/vty/command.h>
+#include <osmocom/vty/buffer.h>
+#include <osmocom/vty/vty.h>
+#include <osmocom/vty/logging.h>
+#include <osmocom/vty/stats.h>
+#include <osmocom/vty/telnet_interface.h>
+#include <osmocom/vty/misc.h>
+#include <osmocom/vty/tdef_vty.h>
+
+#include <osmocom/e1d/proto.h>
+#include "e1d.h"
+
+static struct e1_daemon *vty_e1d;
+
+#if 0
+static void vty_dump_ts(struct vty *vty, const struct e1_ts *ts)
+{
+}
+#endif
+
+static void vty_dump_intf(struct vty *vty, const struct e1_intf *intf)
+{
+	vty_out(vty, "Interface #%u, Driver: FIXME%s", intf->id, VTY_NEWLINE);
+}
+
+DEFUN(show_intf, show_intf_cmd, "show interface [<0-255>]",
+	SHOW_STR "Display information about an E1 Interface/Card\n")
+{
+	struct e1_intf *intf;
+
+	if (argc) {
+		int id = atoi(argv[0]);
+		intf = e1d_find_intf(vty_e1d, id);
+		if (!intf) {
+			vty_out(vty, "%% Unknown interface %u%s\n", id, VTY_NEWLINE);
+			return CMD_WARNING;
+		}
+		vty_dump_intf(vty, intf);
+	} else {
+		llist_for_each_entry(intf, &vty_e1d->interfaces, list)
+			vty_dump_intf(vty, intf);
+	}
+
+	return CMD_SUCCESS;
+}
+
+static int get_remote_pid(int fd)
+{
+	struct ucred uc;
+	socklen_t len = sizeof(uc);
+	int rc;
+
+	rc = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &uc, &len);
+	if (rc != 0)
+		return -1;
+	return uc.pid;
+}
+
+static const struct value_string e1_ts_mode_names[] = {
+	{ E1_TS_MODE_OFF,	"OFF" },
+	{ E1_TS_MODE_RAW,	"RAW" },
+	{ E1_TS_MODE_HDLCFCS,	"HDLC-FCS" },
+	{ 0, NULL }
+};
+
+static void vty_dump_line(struct vty *vty, const struct e1_line *line)
+{
+	int tn;
+
+	vty_out(vty, "Interface #%u, Line #%u:%s", line->intf->id, line->id, VTY_NEWLINE);
+
+	for (tn = 0; tn < ARRAY_SIZE(line->ts); tn++) {
+		const struct e1_ts *ts = &line->ts[tn];
+		vty_out(vty, " TS%02u: Mode %s, FD %d, Peer PID %d%s",
+			ts->id, get_value_string(e1_ts_mode_names, ts->mode),
+			ts->fd, get_remote_pid(ts->fd), VTY_NEWLINE);
+	}
+}
+
+DEFUN(show_line, show_line_cmd, "show line [<0-255>]",
+	SHOW_STR "Display information about an E1 Line\n")
+{
+	struct e1_line *line;
+	struct e1_intf *intf;
+
+	if (argc) {
+		int id = atoi(argv[0]);
+		intf = e1d_find_intf(vty_e1d, id);
+		if (!intf) {
+			vty_out(vty, "%% Unknown interface %u%s\n", id, VTY_NEWLINE);
+			return CMD_WARNING;
+		}
+		llist_for_each_entry(line, &intf->lines, list)
+			vty_dump_line(vty, line);
+	} else {
+		llist_for_each_entry(intf, &vty_e1d->interfaces, list) {
+			llist_for_each_entry(line, &intf->lines, list)
+				vty_dump_line(vty, line);
+		}
+	}
+
+	return CMD_SUCCESS;
+}
+
+void e1d_vty_init(struct e1_daemon *e1d)
+{
+	vty_e1d = e1d;
+	install_element_ve(&show_intf_cmd);
+	install_element_ve(&show_line_cmd);
+}